Mockup maker with a slider that folds its 3D Duo open and shut
Does ShellYeah - Screenshot Mockups work on iPhone Duo?
ShellYeah makes mockups of iPhone Duo: version 2.2.13 (released October 16, 2026) adds Connect-iPhone Duo Outer and Inner canvas sizes in 3D, Flat and Animation modes.
- Developer claimedThe developer, posting as ShellYeahhhhhh (@TreerPP), in a video on X of ShellYeah's 3D Duo mockup opening and closing, with the app's own editor shown on both displays (@TreerPP on X). Earlier posts announced Duo mockups (@TreerPP on X) and iPhone Duo support (@TreerPP on X). The App Store seller is 子捷 陈 (id 6768907932). The release notes for version 2.2.13 (released October 16, 2026) add Connect-iPhone Duo Outer and Inner canvas sizes in 3D, Flat and Animation modes.
Adapted for the fold
- Closed · Outer display
The editor on the cover
Closed, the cover shows the canvas with the preview in the middle and the tools in a rail down the right side.
- Open · Inner display
Settings beside the canvas
Open flat, a settings panel, such as the motion settings, sits on the left beside the canvas and the tool rail.
About ShellYeah - Screenshot Mockups
ShellYeah turns screenshots and screen recordings into 2D and 3D device mockups and short animations. Its developer’s video shows a 3D iPhone Duo mockup with a slider under it: drag it and the phone folds open from the cover to the inner display, with the half that swings away blurring as it turns. The screenshots inside the mockup are ShellYeah’s own editor, on the cover and open flat.
On the ideas wall
All ideas
Making product posters for the Duo has gotten ridiculously easy. Screenshot in, pick an angle, export — done. The open/close blur effect? I replayed it three times. It's already in the review queue. Come on, review team 🔥
Related guides
The best iPhone Duo apps so far (October 2026)
The apps worth installing now that iPhone Duo is on sale, from the apps Apple named as launch partners to indie apps whose developers have shown a real iPhone Duo layout, picked for what they do when you open the phone.
Do your apps work on iPhone Duo? What happens before they're updated
Every iPhone app opens on iPhone Duo, but only updated ones fill the inner display. What an app looks like before its developer adapts it, how to tell which are ready, and which popular apps have said so.
Is this your app?
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Sources: ShellYeahhhhhh on X (x.com) · ShellYeah - Screenshot Mockups on the App Store (apps.apple.com)
More for iPhone Duo
KeepCount
Tyler Hillsman / 1881 Digital, LLC
A board of tally counters: half-folded, counts sit above the fold and the buttons below
Simulator verified: Tyler Hillsman, the developer, in a submission to FoldHunt on October 17, 2026, with an unframed screenshot of the app in the iPhone Duo simulator in the press kit (keepcount.app). The App Store seller is 1881 Digital, LLC. The release notes for version 1.8 (released October 12, 2026) say KeepCount now adapts to the iPhone Duo's inner and outer displays, with a tabletop layout when it's partly folded.
- Book
- Closed
- Open
Calc Pro - The Best Calculator
Panoramic Software Inc.
Ten calculators and converters, with the tape of results beside the calculator when open
Simulator verified: Panoramic Software Inc., the developer, in a submission to FoldHunt on October 18, 2026, and in the App Store release notes for version 7.0.6 (released October 12, 2026), which describe the closed and open layouts. The app's page on the developer's website has pictures of both on the iPhone Duo.
- Closed
- Open
Sticky Widgets
Tyler Hillsman / 1881 Digital, LLC
Sticky notes as widgets, with a larger library and side-by-side editing on the Duo
Simulator verified: Tyler Hillsman, the developer, in the App Store release notes for version 5.4.0 (released October 13, 2026), which add iPhone Duo support with a larger library and side-by-side editing, and in a submission to FoldHunt on October 17, 2026, with an unframed screenshot of the app in the iPhone Duo simulator in the press kit (stickywidgets.app). The App Store seller is 1881 Digital, LLC; the App Store pictures show ordinary iPhones and iPads.
- Open